Walkway collapses outside Lowe's Motor Speedway

Investigators examine the remains of a walkway outside Lowe's Motor Speedway in Concord, N.C., on May 21 after the walkway collapsed after The Winston NASCAR race, injuring more than 100 people.

Investigators examine the remains of a walkway outside Lowe's Motor Speedway in Concord, N.C., on May 21 after the walkway collapsed after The Winston NASCAR race, injuring more than 100 people. (AP/Chuck Burton)

Investigators examine the remains of a walkway outside Lowe's Motor Speedway in Concord, N.C., on May 21 after the walkway collapsed after The Winston NASCAR race, injuring more than 100 people.